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Here is the video that sparked my discussion (Start at 17:02)
I don't really see how he reversed the building. I mean it only looks like he stopped it from falling and put it back. There is no way of knowing if it fell again after they ran away. In the scene of the jail in Thor, Loki made the same gesture with his arms and used telekinesis to throw around chairs and other things, there's no saying that he couldn't just put them back the same way.
I don't understand the whole time stone theory because of the fact if he had it and we know the time stone manipulates time. It's entirely possible that Loki's powers became more controlled and that he can do exactly what was shown. If Loki palmed a Time Stone, why not rewind time at the end of the episode to retry the Ark escape? Why didn't Loki redo the failed train heist or zoom Sylvie back so he could re-examine her words, similar to how Sylvie manipulated C-20 in the show's open?
The series has proven too strong to leave those kinds of questions open, making Loki's theorized use of the Time Stone unlikely.
Studying the moment Loki stops the rubble from falling reveals how it's done. Loki faces the falling stone with a stoic warrior's posture and snaps a full-body gesture that looks like it has real weight and power behind it. Starting with both arms in the air, wrists crossed, he thrusts them down and immediately heaves for breath. What he's done has taken him some serious energy. But the stone rises back into place, and the pair resumes fleeing.
The rubble isn't actually rewinding. It looks like it at first because forcing the structure up makes the smoke cloud flow back into its previous spot. However, it isn't a reversal. Instead, the smoke is responding to displacement pressure and sucking itself back into the newly empty space, like a tidal wave. The broken structure is also pouring liquid as it prepares to fall on Loki, Sylvie, and the endangered people, but the liquid never reverses and runs back up the stone. It's all in real-time, no tricks.
There's a better question of why Loki has held back on the limits of his power for so long. For one, this act of raw power took visible effort on his part, meaning there are some logical boundaries to what a sorcerer like him can do in a given day. After he did the trick he had to pause and breathe for a bit of time before he continued running. Unless he explains more in Loki's next episode, it's hard to know his motivations, much less his real limitations. Loki's mind is his ultimate superpower, but unlike the Avengers, he keeps as many secrets as he does hidden blades.
That's all I got. If you are still here comment your thoughts on my explanation. Also, I am working on chapter 4 of my story "Treadway? What no I'm Stiles" today so it will most likely be out today. Also, sorry I didn't put which specific Thor movie the jail scene is, I haven't actually watched any Thor movies yet but have seen that scene multiple times.